公开(公告)号：US20240026491A1

公开(公告)日：2024-01-25

申请号：US18110036

申请日：2023-02-15

Applicant: ArcelorMittal

Inventor： Frédéric BONNET ,  Yannick DOH

IPC: C21D11/00 ,  B32B15/01 ,  C21D1/667 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C23C2/06 ,  C23C2/28

CPC classification number: C21D11/005 ,  B32B15/012 ,  B32B15/013 ,  C21D1/667 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0236 ,  C21D9/46 ,  C23C2/06 ,  C23C2/29 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

Abstract: A method for manufacturing a thermally treated steel sheet is described. The method includes:



A. preparation step containing:

1) a selection substep, wherein:

a. mtarget and a chemical composition are compared to a list of predefined products, whose microstructure contains predefined phases and predefined proportion of phases, and a product having a microstructure mstandard closest to mtarget and TPstandard is selected, including at least a heating, a soaking and a cooling steps, to obtain mstandard,
b. a heating path, a soaking path including a soaking temperature Tsoaking, a power cooling of the cooling system and a cooling temperature Tcooling are selected based on TPstandard and


2) a calculation substep, wherein through variation of the cooling power, new cooling paths CPx are calculated based on the product selected in step A.1)a and TPstandard, the initial microstructure mi of the steel sheet to reach mtarget, the heating path, the soaking path comprising Tsoaking and Tcooling, the cooling step of TPstandard is recalculated using said CPx in order to obtain new thermal paths TPx, each TPx corresponding to a microstructure mx,
3) a selection substep wherein one TPtarget to reach mtarget is selected, TPtarget being chosen among the calculated thermal paths TPx and being selected such that mx is the closest to mtarget, and


B. a thermal treatment step wherein TPtarget is performed on the steel sheet.

公开(公告)号：US20200032368A1

公开(公告)日：2020-01-30

申请号：US16469231

申请日：2017-12-20

Applicant: ArcelorMittal

Inventor： Frédéric BONNET ,  Yannick DOH

IPC: C21D11/00 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C21D1/667 ,  C23C2/06 ,  C23C2/28 ,  B32B15/01

Abstract: A method for manufacturing a thermally treated steel sheet is described. The method includes: A. preparation step containing: 1) a selection substep, wherein: a. mtarget and a chemical composition are compared to a list of predefined products, whose microstructure contains predefined phases and predefined proportion of phases, and a product having a microstructure mstandard closest to mtarget and TPstandard is selected, including at least a heating, a soaking and a cooling steps, to obtain mstandard, b. a heating path, a soaking path including a soaking temperature Tsoaking, a power cooling of the cooling system and a cooling temperature Tcooling are selected based on TPstandard and 2) a calculation substep, wherein through variation of the cooling power, new cooling paths CPx are calculated based on the product selected in step A.1) a and TPstandard, the initial microstructure mi of the steel sheet to reach mtarget, the heating path, the soaking path comprising Tsoaking and Tcooling, the cooling step of TPstandard is recalculated using said CPx in order to obtain new thermal paths TPx, each TPx corresponding to a microstructure mx, 3) a selection substep wherein one TPtarget to reach mtarget is selected, TPtarget being chosen among the calculated thermal paths TPx and being selected such that mx is the closest to mtarget, and B. a thermal treatment step wherein TPtarget is performed on the steel sheet.